Is there any anisotropic solver for solid stress analysis?

stickjohnson · October 29, 2011, 01:57

Hi,

I try to solve an anisotropic solid stress analysis problem (vessel wall). Is there any suitable solver available? It is better if it can accept the 6by6 matrix as an input (3D). Tired to search online and didn't find one. Any suggestion is appreciated. Also, I can write a one based on the isotropic version if there is any literature about this topic.

thanks,
johnson

bigphil · October 29, 2011, 08:45

Hi Johnson,

As far as I know, there are no anisotropic stress solvers currently implemented in OpenFOAM.

The basic OpenFOAM finite volume stress solvers are described in:

H.G. Weller , G. Tabor , H. Jasak , C. Fureby. A Tensorial Approach to Computational Continuum Mechanics using Object Orientated Techniques (1998)

and in more detail in:
Jasak, H. and Weller, H.G.: Application of the Finite Volume Method and Unstructured Meshes to Linear Elasticity

As well as these basic linear elastic small strain solvers ($FOAM_SOLVERS/newStressAnalysis/newStressedFoam), more complex mechanisms such as plasticity, crack propagation, contact, large strains, FSI, etc. have been implemented but I haven't come across anisotropy.

I would interested in an anistropic material model, I imagine the best place to start would be looking at the material models at:
$FOAM_SOLVERS/newStressAnalysis/materialModels/rheologyModel/rheologyLaws

Philip

stickjohnson · October 29, 2011, 20:31

Hi Philip,

Thank you for your reply. I already read the two papers. I know there are other packages such as ansys and FEAP and is it possible to couple them together since I actually need a FSI solver.

thanks,
johnson

bigphil · October 30, 2011, 16:54

johnson,

I think it should be possible to implement anisotropy in the OpenFOAM finite volume structural solvers however it might be a bit of effort coding it.

As an alternative, it is possible to link third-party FE packages with OpenFOAM as described during the OpenFOAM workshop by Rob Campbell and Brent Craven at PSU:
R. Campbell, B. Craven. FSI in OpenFOAM using a ThirdParty Structural Solver. OpenFOAM Workshop, Penn State, 2011

Philip

stickjohnson · October 31, 2011, 01:45

Hi Philip,

I decide to couple CalculiX and openfoam to build the FSI solver. Any way to find out the interface of CalculiX to openfoam?

thanks,
johnson

bigphil · October 31, 2011, 07:49

johnson,

As far as I can see, the method used by Campbell and Craven should work for any FE package (if you can get the FE package to read in the pressures and write out the displacements). I think the solver they used is included in the OpenFOAM workshop kubuntu image.
Instructions to use this image can be found here, under the virtual box section.

Philip

elvis · October 31, 2011, 15:51

Hi,

as Philip mentioned at the OF workshop there was a presention http://www.openfoamworkshop.org/6th_...ell_slides.pdf
and a FSI-"skeleton"-case OF<->Calculix http://www.openfoamworkshop.org/6th_...mpbell_fsi.tgz

(see page7 slide) for non-conforming FVM<->FEM meshes GGI might be the "tool" to handle that.
But here Sample solver requires matching interface meshes

October 29, 2011, 01:57	Is there any anisotropic solver for solid stress analysis?	#1
stickjohnson New Member h z Join Date: Sep 2011 Posts: 6 Rep Power: 15	Hi, I try to solve an anisotropic solid stress analysis problem (vessel wall). Is there any suitable solver available? It is better if it can accept the 6by6 matrix as an input (3D). Tired to search online and didn't find one. Any suggestion is appreciated. Also, I can write a one based on the isotropic version if there is any literature about this topic. thanks, johnson

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October 29, 2011, 08:45		#2
bigphil Super Moderator Philip Cardiff Join Date: Mar 2009 Location: Dublin, Ireland Posts: 1,097 Rep Power: 34	Hi Johnson, As far as I know, there are no anisotropic stress solvers currently implemented in OpenFOAM. The basic OpenFOAM finite volume stress solvers are described in: H.G. Weller , G. Tabor , H. Jasak , C. Fureby. A Tensorial Approach to Computational Continuum Mechanics using Object Orientated Techniques (1998) and in more detail in: Jasak, H. and Weller, H.G.: Application of the Finite Volume Method and Unstructured Meshes to Linear Elasticity As well as these basic linear elastic small strain solvers ($FOAM_SOLVERS/newStressAnalysis/newStressedFoam), more complex mechanisms such as plasticity, crack propagation, contact, large strains, FSI, etc. have been implemented but I haven't come across anisotropy. I would interested in an anistropic material model, I imagine the best place to start would be looking at the material models at: $FOAM_SOLVERS/newStressAnalysis/materialModels/rheologyModel/rheologyLaws Philip

October 29, 2011, 20:31		#3
stickjohnson New Member h z Join Date: Sep 2011 Posts: 6 Rep Power: 15	Hi Philip, Thank you for your reply. I already read the two papers. I know there are other packages such as ansys and FEAP and is it possible to couple them together since I actually need a FSI solver. thanks, johnson

October 30, 2011, 16:54		#4
bigphil Super Moderator Philip Cardiff Join Date: Mar 2009 Location: Dublin, Ireland Posts: 1,097 Rep Power: 34	johnson, I think it should be possible to implement anisotropy in the OpenFOAM finite volume structural solvers however it might be a bit of effort coding it. As an alternative, it is possible to link third-party FE packages with OpenFOAM as described during the OpenFOAM workshop by Rob Campbell and Brent Craven at PSU: R. Campbell, B. Craven. FSI in OpenFOAM using a ThirdParty Structural Solver. OpenFOAM Workshop, Penn State, 2011 Philip

October 31, 2011, 01:45		#5
stickjohnson New Member h z Join Date: Sep 2011 Posts: 6 Rep Power: 15	Hi Philip, I decide to couple CalculiX and openfoam to build the FSI solver. Any way to find out the interface of CalculiX to openfoam? thanks, johnson

October 31, 2011, 07:49		#6
bigphil Super Moderator Philip Cardiff Join Date: Mar 2009 Location: Dublin, Ireland Posts: 1,097 Rep Power: 34	johnson, As far as I can see, the method used by Campbell and Craven should work for any FE package (if you can get the FE package to read in the pressures and write out the displacements). I think the solver they used is included in the OpenFOAM workshop kubuntu image. Instructions to use this image can be found here, under the virtual box section. Philip

October 31, 2011, 15:51		#7
elvis Senior Member Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 620 Blog Entries: 6 Rep Power: 24	Hi, as Philip mentioned at the OF workshop there was a presention http://www.openfoamworkshop.org/6th_...ell_slides.pdf and a FSI-"skeleton"-case OF<->Calculix http://www.openfoamworkshop.org/6th_...mpbell_fsi.tgz (see page7 slide) for non-conforming FVM<->FEM meshes GGI might be the "tool" to handle that. But here Sample solver requires matching interface meshes